diff --git a/img/cfgsimple2.dot b/img/cfgsimple2.dot
deleted file mode 100644
index 9864d3e..0000000
--- a/img/cfgsimple2.dot
+++ /dev/null
@@ -1,5 +0,0 @@
-digraph g {
-s [shape=box,label=<Start<br/>x = x_in<br/>y = y_in>];
-		End [shape=box,label=<x_out = x<br/>End>];
-		s -> "while (x > y)" -> "x = x - 1" -> "while (x > y)" -> "print(x)" -> End;
-}
diff --git a/img/cfgsimple2.pdf b/img/cfgsimple2.pdf
deleted file mode 100644
index 8a79181..0000000
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diff --git a/img/pdgsimple.dot b/img/pdgsimple.dot
deleted file mode 100644
index 4adfc1d..0000000
--- a/img/pdgsimple.dot
+++ /dev/null
@@ -1,30 +0,0 @@
-digraph g {
-	Start [shape=box];
-	l2 [label="a = 10"];
-	l3 [label="b = 20"];
-	l4 [label="f(a, b)"];
-	p1 [label="x_in = a"];
-	p2 [label="y_in = b"];
-	p3 [label="a = x_out"];
-	l5 [label="print(a)"];
-	// Rank
-	{ rank = same; l2; l3; l4; l5; }
-	{ rank = min; Start; }
-	{ rank = same; p1; p2; p3; }
-	// Control
-	{ edge [style = bold];
-		Start -> { l2 l3 l4 l5 };
-		l4 -> { p1 p2 p3 };
-	}
-	// Data
-	{ edge [color = red];
-		l2 -> p1;
-		l3 -> p2;
-		p3 -> l5;
-	}
-	// Order
-	{ edge [style = invis];
-		l2 -> l3 -> l4 -> l5;
-		p1 -> p2 -> p3;
-	}
-}
diff --git a/img/pdgsimple.pdf b/img/pdgsimple.pdf
deleted file mode 100644
index df3230d..0000000
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diff --git a/img/pdgsimple2.dot b/img/pdgsimple2.dot
deleted file mode 100644
index 56bebb6..0000000
--- a/img/pdgsimple2.dot
+++ /dev/null
@@ -1,27 +0,0 @@
-digraph g {
-    Start [shape=box];
-	s1 [label="x = x_in"];
-	s0 [label="y = y_in"];
-	s2 [label="while (x > y)"];
-	s3 [label="x = x + 1"];
-	s4 [label="print(x)"];
-	s5 [label="x_out = x"];
-	// Rank
-	{ rank=same; s0; s1; s5; }
-	{ rank=same; s2; s4; }
-	{ rank=min; Start; }
-	s0 -> s2 [style=invis];
-	// Control
-	{
-		edge [style = bold];
-		Start -> {s0 s1 s2 s4 s5};
-		s2 -> s3;
-	}
-	// Data
-	{
-		edge [color = red];
-		edge [constraint = false];
-		{s1 s3} -> {s2 s3 s4 s5};
-		s0 -> s2;
-	}
-}
diff --git a/img/pdgsimple2.pdf b/img/pdgsimple2.pdf
deleted file mode 100644
index 2690aea..0000000
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